Article
Engineering, Civil
Hao Zhang, Baixue Chang, Kefeng Peng, Jilin Yu, Zhijun Zheng
Summary: This study investigates the anti-blast response of density-graded foam-filled tubes as a core layer for sacrificial cladding. The results demonstrate that the negatively graded foam-filled tube with a small density gradient is a good choice for designing anti-blast sacrificial cladding with a small critical length and low transmitted force. Additionally, a contour map is established to determine the critical length required to absorb the impulse of blast loading for different gradient parameters and outer tube dimensions. This study provides a new design guideline for superior blast resistance structures in engineering applications.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Mechanical
Hongyuan Zhou, Jiale Fan, Xiaojuan Wang, Guowei Ma, Shangjiang Yu, Yonghui Wang
Summary: In this study, a sacrificial cladding with foam concrete filled aluminum tube as the core is proposed for structural protection against blast load. The energy absorption capacity of the cladding is experimentally investigated through quasi-static compressive test and blast test. Numerical investigations are also conducted to analyze the effect of foam concrete density, aluminum tube thickness, and tube spacing on the cladding's protective performance. The results show that foam concrete density and tube squeezing significantly influence the energy absorption capacity, and increasing foam concrete density improves the protective performance. Increasing foam concrete density and aluminum tube thickness, and reducing tube spacing can effectively reduce the energy input to the system.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Engineering, Mechanical
Hongyuan Zhou, Xuejian Zhang, Xiaojuan Wang, Xiuli Du, Shangjiang Yu, Yonghui Wang, Jin Jiang
Summary: The present study investigated the protection effectiveness of sacrificial cladding under near-field blast through experimental and numerical methods. Results showed that increasing face plate thickness and core strength can achieve positive protection effects by reducing energy input to the system and increasing energy absorption of the cladding.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Chemistry, Physical
Ludovic Blanc, Therese Schunck, Dominique Eckenfels
Summary: The sacrificial claddings filled with different brittle materials were studied under blast loading, showing that concrete foam and granular media can act effectively as a crushable core with significant differences in energy dissipation mechanisms. Granular media, treated as cellular material, provided key parameters for understanding the crushing process. Granular media tend to function as a core even under low intensity load, unlike more traditional crushable cores.
Article
Engineering, Civil
H. B. Rebelo, C. Cismasiu
Summary: Although sacrificial cladding solutions are effective in improving the blast resistant capabilities of structural elements, considering the probabilistic variability of key parameters is crucial in the design process to prevent negative impacts on structural safety. Additionally, deterministic approaches may allow for higher charge weights compared to probabilistic approaches.
ENGINEERING STRUCTURES
(2021)
Article
Chemistry, Physical
Kuixin Lin, Yongkang Tan, Hongmei Chen, Xiaoma Tao, Yifang Ouyang, Yong Du
Summary: In this study, molecular dynamics simulations were conducted to investigate the shock-wave propagation in nanocomposites consisting of different low-dimensional carbon materials (FCC-C60, MCNT, or MGNS) and monocrystal Al. The results revealed the intrinsic correlation between their phononic characteristics and shock-wave energy absorption. It was found that MCNT exhibited superior elastic absorption, reducing the shock-wave intensity by 80%. The dispersion mechanism mediated by the interaction between mid-frequency phonons and shock-wave played a significant role in absorbing large amounts of shock-wave energy. Additionally, the dissipation mechanism arising from thermal phonon scattering and interfacial phonon damping contributed to the energy absorption process.
Article
Materials Science, Composites
V. Kostopoulos, G. D. Kalimeris, E. Giannaros
Summary: This study investigates the effectiveness of a composite foam-core sacrificial cladding for blast protection of steel reinforced concrete structures using explicit finite element analysis. The results demonstrate that the foam conical-array configuration in the composite sacrificial cladding is effective in reducing the peak force applied on the concrete structure by 50% compared to a uniform rear foam layer of the same thickness, and it is 71% lighter than the conventional sheet core.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Construction & Building Technology
Yu Zhang, Yufeng Wen, Ben Liu, Xianlong Wen, Zhejian Li, Hong Hao, Wensu Chen
Summary: This study investigates the blast mitigation performance of kirigami corrugated (KC) panels filled with polyurethane foam as sacrificial cladding. The effects of filling polyurethane foam on the energy absorption capacity and deformation of KC units were analyzed experimentally. Blast simulations were then conducted to compare the protective effectiveness of different types of cladding.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Liquan Gu, Yonghui Wang, Ximei Zhai
Summary: A new sacrificial cladding, named foam concrete-filled square tubes (FCFST sacrificial cladding), was developed to absorb impact energy. Experimental and simulation analysis were conducted to study the deformation modes, force-displacement responses, and energy absorption performances of the FCFST sacrificial claddings. The results showed that increasing the contact area between the sacrificial cladding and impactor enhanced the energy absorption performance, and foam concrete-filled tubes dissipated more impact energy than other parts of the cladding.
Article
Engineering, Civil
Xuejian Zhang, Xiaojuan Wang, Hongyuan Zhou, Xiuli Du, Hai-Lin Zou, Tianyi Song, Yonghui Wang, Hong Zhang
Summary: A novel cladding-connector system consisting of sacrificial cladding and connectors was proposed to protect vulnerable walls in frame structures from blast loads. The system achieved both high energy absorption and low load transfer. The numerical model was established and validated using compression tests and blast tests. Comparisons between systems with flexible and rigid connectors showed that the system with flexible connectors exhibited superior performance in terms of energy absorption and load transfer, especially under intense blasts. The proposed system with flexible connectors was more promising for effectively protecting existing frame structures against blasts.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Aerospace
Heng Liu, Veronica Eliasson
Summary: Geometrical shock dynamics (GSD) is an efficient model for predicting the position, shape, and strength of a shock wave. Preserving the intact post-shock flow term is crucial for accurately predicting blast motion when modeling blast wave propagation.
Article
Engineering, Mechanical
Edward Chern Jinn Gan, Alex Remennikov, David Ritzel
Summary: This paper investigates the potential of using trees as natural blast barriers and reveals their ability to attenuate far-field blast waves and protect infrastructure targets through experimental results. A numerical model based on Computational Fluid Dynamics in ANSYS FLUENT is developed to explain the blast mitigation mechanism of barriers against far-field blast loads and to interpret experimental observations.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Polymer Science
Zhidong Liu, Xiaohua Zhao, Da Liu, Gaohui Wang, Mingsheng Shi
Summary: This study compares and selects numerical simulation methods suitable for exploring the blast damage mitigation effect of polyurethane sacrificial cladding on reinforced concrete slabs. The results show that the SPH-FEM coupling model is the most applicable method for simulating the damage features of polyurethane sacrificial cladding.
Article
Construction & Building Technology
Zhidong Liu, Xiaohua Zhao, Hongyuan Fang, Gaohui Wang, Mingsheng Shi
Summary: The blast damage mitigation effect of polyurethane sacrificial cladding on reinforced concrete structures was studied, and a prediction formula for mid-span displacement was proposed. The results showed that the polyurethane sacrificial cladding could effectively disperse blast loads, change the damage mode of the reinforced concrete slab, and demonstrated good mitigation ability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Mechanical
Sri Datta Rapaka, Manoj Pandey, Ratna Kumar Annabattula
Summary: The study investigates the dynamic compressive behavior of foams with non-linear variation in cross-sectional area profiles. Different types of foams, including convergent foams and divergent foams, exhibit unique characteristics when subjected to impact, leading to variations in energy dissipation. The research highlights the importance of area-profile variations in determining the dissipation performance of foams under dynamic loading conditions.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Construction & Building Technology
Feng Yu, Hao Zhou, Nan Jiang, Yuan Fang, Jie Song, Chaochao Feng, Yucong Guan
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Engineering, Civil
Ping Wu, Jie Liu, Feng Yu, Yuan Fang, Defeng Zhu
Summary: This study presents experimental investigation on the behavior of PVC-CFRP confined concrete column-reinforced concrete beam joints (PCCC-RCBJ) under axial load. The results show that increasing stirrup ratio, width, and reinforcement ratio enhances the carrying capacity of the joints, while an increase in ring beam height decreases it. The load-displacement curves exhibit different stages including elastic, crack development, and yield stages, impacting the performance of PCCC-RCBJs.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2021)
Article
Engineering, Chemical
Kefeng Peng, Hao Pan, Zhijun Zheng, Jilin Yu
Summary: The study found that the relative density and uniformity of Cu-W composite powders have an impact on the densification process, with higher relative density or more uniform composite powders leading to better densification. The densification processes can be divided into three stages: particle rearrangement, Cu particle deformation, and W particle deformation.
Article
Engineering, Manufacturing
Yuanrui Zhang, Gaofei Wang, Yongliang Zhang, Jian Ye, Ting Zeng, Kai Zhao, Zhijun Zheng, Rui Wan
Summary: The study proposed a sandwich threshold composed of an original threshold, an aluminium foam, and a square tube, showing good load-bearing and energy absorption capacity in finite element simulation and experiments. It can effectively improve the crash safety and crashworthiness of the car.
INTERNATIONAL JOURNAL OF CRASHWORTHINESS
(2022)
Article
Materials Science, Multidisciplinary
Yudong Zhu, Zhijun Zheng, Yongliang Zhang, HengAn Wu, Jilin Yu
Summary: This study overcame the numerical challenges in elastic adhesion of solids by employing a new solving program with multiple techniques, resulting in efficient and precise calculations. Different from existing models, adhesive contact of wavy surfaces exhibits additional oscillations, and pull-off force shows an initial increase followed by a decrease with increasing roughness.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Engineering, Mechanical
Kefeng Peng, Zhijun Zheng, Baixue Chang, Hao Pan, Jilin Yu
Summary: This study introduces a novel cylindrical shell chain structure with varying aspect ratio for controlling elastic wave propagation, including waveform attenuation and amplification. By studying the impact of aspect ratio gradient on wave propagation, it is found that aspect ratio gradient chains can control transmitted impulse in a wider range effectively.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Kaijin Wu, Yonghui Song, Xiao Zhang, Shuaishuai Zhang, Zhijun Zheng, Xinglong Gong, Linghui He, Hong-Bin Yao, Yong Ni
Summary: The application of prestresses is a valuable strategy for enhancing the overall mechanical performances of structural materials. This study reveals the effects of prestresses on the tablets-sliding mechanism in nacre-like structures and demonstrates that the prestressing strategy can enhance the impact resistance of engineering structural materials and energy storage devices.
Article
Materials Science, Multidisciplinary
Kefeng Peng, Zhijun Zheng, Hao Pan, Yongliang Zhang, Kai Zhao, Jilin Yu
Summary: The cold die compaction behaviors of granular material are investigated and a strain-activated statistical compaction model is developed to address its deformation mechanisms. The model is validated through simulations and experiments, showing its effectiveness in capturing the compression stress-strain curves of granular materials with different initial densities. The dependence of the model's parameters on initial relative density is analyzed, and the quantitative statistical relationships are determined, with the model's 3D results proving to be more reasonable than the 2D results.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Mechanical
Kefeng Peng, Zhijun Zheng, Baixue Chang, Fenghua Zhou, Jilin Yu
Summary: This paper presents theoretical, numerical, and experimental studies on the response of 3D-printed density gradient cylindrical shell chains under striker impact. The study shows that positive/negative density gradient chains can strongly attenuate the impact impulse. The relationship between the linear density distribution parameter of the chains and the transmitted peak force is explained by analyzing the wave impedance mismatch.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Engineering, Civil
Gaofei Wang, Yongliang Zhang, Zhijun Zheng, Haibo Chen, Jilin Yu
Summary: This paper proposes a novel design of foam-filled crash boxes to enhance the energy absorption and protection capability. The study finds that partial filling design reduces material usage and increases specific energy absorption. An improved optimization strategy is proposed by considering material utilization and deformation stability. Experimental validation confirms the effectiveness of this method.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Mechanical
Baixue Chang, Zhijun Zheng, Yuanrui Zhang, Yongliang Zhang, Kai Zhao, Jilin Yu
Summary: This study verifies the feasibility and reliability of the backward design strategy for crashworthiness of graded cellular materials, providing guidance for crashworthiness design in engineering practice.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Yudong Zhu, Zhijun Zheng, Chenguang Huang, Jilin Yu
Summary: In this study, a full self-consistent model (FSCM) is developed for the axisymmetric adhesive contact between a rigid punch and a power-law graded elastic half-space. The FSCM equations are solved numerically, and case studies for power-law punch profiles are performed. The results show that the force-displacement curves are influenced by the generalized Tabor number, and a continuous transition from the JKR model to the Bradley model is observed. Furthermore, an improved M-D-n-k model is proposed and validated against the FSCM results.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Engineering, Civil
Hao Zhang, Baixue Chang, Kefeng Peng, Jilin Yu, Zhijun Zheng
Summary: This study investigates the anti-blast response of density-graded foam-filled tubes as a core layer for sacrificial cladding. The results demonstrate that the negatively graded foam-filled tube with a small density gradient is a good choice for designing anti-blast sacrificial cladding with a small critical length and low transmitted force. Additionally, a contour map is established to determine the critical length required to absorb the impulse of blast loading for different gradient parameters and outer tube dimensions. This study provides a new design guideline for superior blast resistance structures in engineering applications.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Shao-Meng Wen, Si-Ming Chen, Weitao Gao, Zhijun Zheng, Jia-Zheng Bao, Chen Cui, Shuai Liu, Huai-Ling Gao, Shu-Hong Yu
Summary: Biological materials with synergistic structural design elements often have excellent mechanical properties. Incorporating multiple biostructural elements into a single artificial material is challenging but promising for enhancing mechanical properties. In this study, a biomimetic structural design strategy is proposed to improve the impact resistance of ceramic-polymer composites by combining a gradient structure with a twisted plywood Bouligand structure. The resulting biomimetic ceramic-polymer composites with a gradient Bouligand (GB) structure show improved peak force and total energy absorption. This biomimetic design strategy may provide insights for developing lightweight and impact-resistant structural materials in the future.
ADVANCED MATERIALS
(2023)
Article
Engineering, Mechanical
Yudong Zhu, Zhijun Zheng, Chenguang Huang, Jilin Yu
Summary: A full self-consistent model is established to describe the adhesive contact between a rigid punch and a Gibson solid. The self-consistent equation is expressed in a dimensionless form using shape index and Tabor number as parameters. When the Tabor number exceeds a critical value, jump-in instability and adhesion hysteresis occur, and the folding phenomenon of the Gibson solid surface is observed. An asymptotic solution is derived for the soft limit of the model, presenting a power-law relation between the dimensionless pull-off force and the Tabor number. This study provides a self-consistent toy model for the adhesive contact of Gibson solid, deepening the understanding of graded materials adhesion.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
